13. d1c2 [%c_effect c2;square;c2;type;Interesting;persistent;true] This is Nepomniachtchi's new idea, good enough for a rapid game. As often happens, no more than five minutes after the new move is played, opening experts from all over the world will come up with an antidote, but by then the novelty may have already borne fruit. 13... c6b4 A tempting move, sending the king to the strange b1-square. 14. c2b1  14... e8g8  15. b3d4 [%c_effect d4;square;d4;type;GreatFind;persistent;true] The only justification for White's play. Naturally, Nepomniachtchi played this immediately.